Azure DevOps - Multiple projects with multiple Kanban boards vs Single Project with multiple repositories

Question

I'm thinking to move to Azure DevOps. But I'm at the stage where it's hard to decide which option will be useful.

My Requirements:

1. Single dashboard for the current sprint to have transparency to everyone in the team. No context switching.
2. Single backlog for all projects.
3. User stories & bugs will be easily identified by the project.
4. Reports by projects, teams, etc.
5. Service hooks - Microsoft teams, etc.
6. Source control - GIT.
7. Artifacts.
8. Test plans under one board.

I'm thinking of going with a single project(multiple repositories)

My question is what are the pros and cons of both options?